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Colorectal cancer (CRC) is the second leading cause of cancer-related death in the United States. There have been improvements in screening, and therefore overall survival, but patients continue to present at late stages when minimal treatment options are available to them. While some targeted therapies have been introduced, their application is limited by patient-specific tumor characteristics. Additional targets for CRC in patients who present at a late stage, or who experience tumor relapse, need to be identified to continue to improve patient outcomes. This review focuses on emerging pathways and drug targets for the treatment of colorectal cancer. The shift to the cancer stem cell model and potential targets involving Wnt, NF-κB, phosphodiesterases, RAS, and guanylyl cyclase C, are discussed. The current utility of checkpoint inhibitors and evolving immunological options are examined. Surgery and current systemic cytotoxic therapies are inadequate to appropriately treat the full spectrum of CRC, especially in those patients who present with metastatic or treatment-refractory disease. In addition to the identification of new, more generalizable targets, additional focus is being placed on novel administrations. Immuno-oncologic options and stem cell-targeting therapies for mCRC will become available to patients and may increase survival.

Emerging drug targets for colon cancer: A preclinical assessment